Heerkulkee ayaa dareeraha bareegga ku barafoobaa?
Tusmo
Barafka qaboojinta dareeraha bireega sida waafaqsan heerka
Waxaa muhiim ah in la fahmo in aysan jirin cunto karis adag oo loogu talagalay soo saarista dareeraha biriiga. Heerarka ay samaysay oo ay fulisay Waaxda Gaadiidka ee Maraykanka (DOT) ayaa qeexaysa dhawr shuruudood oo dareere ah oo loogu talagalay nidaamyada biriiga hawo-mareenka. Laakiin ma jiraan qiyaaso adag ama xidhmo.
Tusaale ahaan, barta karkarinta ee dareeraha biriiga, kaliya xadka hoose ayaa la tilmaamayaa. Badeecada DOT-4 ee ugu caansan Ruushka, tiradani kama hoosayso +230°C. Ficil ahaan, halka karkarinta dhabta ah ee dareeraha bireega ee DOT-4 ee aan lagu hodmin badiyaa waxa uu dhaafaa +260°C.
Xaalad la mid ah ayaa lagu arkay barta shubanka. Halbeeggu ma nidaamiyo barta qaboojinta lafteeda, laakiin viscosity at -40 ° C dhaxan. Jadwalka hoose ayaa soo koobaya viscosity-ka ugu badan ee la ogol yahay heerkulkan ee dareerayaasha biriiga hadda.
| DOT-3 | 1500 sst |
| DOT-4 | 1800 sst |
| DOT-5 | 900 sst |
| DOT-5.1 | 900 sst |
Dhammaan qiimayaashan waa kuwo la aqbali karo waxqabadka nidaamyada biriiga ee loogu talagalay dareere gaar ah heerkulka hoos -40 ° C. Waxqabadka heerkulka hooseeya, heerka DOT-yada caadiga ah mas'uul kama aha. Cimilo aad u daran, noocyo wax laga beddelay oo dareeraha biriiga ah ayaa la sameeyay, taas oo xoogga la saarayo tayada heerkulka hooseeya.
Heerkul baraf dhab ah iyo macnihiisa la taaban karo
Dheecaanka biriiga waxa uu ciyaaraa door sidaha tamarta laga bilaabo dhululubada barriga sayidkiisa ilaa shaqaalaha. Marka aad riixdo badadka biriiga, cadaadis ayaa ku abuurma dhululubada weyn ee torus, kaas oo ku faafaya xariiqda, ku dhaqma bistoonnada dhululubada shaqada oo ku cadaadiya suufka saxannada.
Marka la gaaro viscosity gaar ah, dareeruhu ma awoodi doono inuu dhex maro khadadka dhuuban iyo kuwa dhaadheer. Biriigkuna wuu fashilmi doonaa, ama shaqadoodu aad bay u adkaan doontaa. Marka loo eego qiyaaso kala duwan, nidaamyo kala duwan, heerkani wuxuu ku dhex jiraa inta u dhaxaysa 2500-3000 cSt.
Heerkulkee ayaa dareeraha bireegu ku barafoobaan xaaladaha dhabta ah? Shabakadu waxay leedahay tijaabooyin badan oo qaboojinta dareeraha biriiga ee kala duwan ee ka hooseeya -40 ° C. Isbeddelku waa sida soo socota: dhammaan dareerayaasha, marka ay dhex maraan heerkulka muhiimka ah, weli waxay sii hayaan dareeraha, iyo aragti ahaan waxay si caadi ah ugu shaqeyn doonaan nidaamka biriiga. Si kastaba ha ahaatee, viscosity ee dareerayaasha qiimaha jaban iyo doorarka hoose ee DOT ayaa si degdeg ah u kordhaya inta lagu jiro qaboojinta.
Marka la gaaro calaamadda -50°C, badi DOT-3 iyo DOT-4 waxay isu beddelaan malab ama xitaa way adkaadaan si ay u noqdaan cufan (doorashooyinka jaban). Oo tani waxay la socotaa xaalad ah in dareeruhu yahay mid cusub, oo aan hodmin biyo. Joogitaanka biyuhu waxay hoos u dhigtaa heerka iska caabinta baraf 5-10°C.
Dheecaannada biriiga silikoonka iyo qaab-dhismeedka ku salaysan polyglycols (DOT-5.1) ayaa aad ugu adkaysan kara qaboojinta. Si kastaba ha ahaatee, xitaa dareerayaashan ayaa si aad ah u dhumuc weyn u leh -50 ° C. Wayna adag tahay in la sheego inay ku shaqayn doonaan nidaamyada si gaar ah loogu talagalay doorashooyinka dareeraha biriiga ee aan muuqan.
Sidaa darteed, hal gabagabo oo kaliya ayaa la soo saari karaa: waxaa la dammaanad qaaday in dareeraha biriiga uusan barafeynin heerkulka ilaa -40 ° C, sida ku cad heerka.
